drivers: dma: edma: Put the TCD pool in DTCM by default

To reduce the latency of CPU accessing/modifying SW TCD content, it
better to put TCD pool to DTCM by default.

Signed-off-by: Raymond Lei <[email protected]>

Author: Raymond0225

drivers/dma/Kconfig.mcux_edma

@@ -44,6 +44,8 @@ config DMA_MCUX_TEST_SLOT_START
 
 config DMA_MCUX_USE_DTCM_FOR_DMA_DESCRIPTORS
 	bool "Use DTCM for DMA descriptors"
+	default y
+	depends on DT_HAS_NXP_IMX_DTCM_ENABLED
 	help
 	  When this option is activated, the descriptors for DMA transfer are
 	  located in the DTCM (Data Tightly Coupled Memory).